here's my 76 conversion using the exsisting mounts....it places the bumper an inch & 1/2 higher than the correct mounts but i don't think it looks bad at all
i used a piece of heavy angle iron, attached those to the bumper brackets, slid them into the square bumper mounts, drilled holes and used the same bolts....the front was fast and friendly..the rear a bit more hassle

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